Quote:
Originally Posted by fckm
It is possible to convert energy into mass. A photon, which has no rest mass, of a high enough energy (say a gamma ray) can spontaneously convert itself into an electron/positron pair. This process is called pair production. Where you had zero rest mass before hand, you now have a mass of 2 Me (electron mass). Hence, we say that Mass Conservation is not a Universal Law, it's scope is limited to classical physics.
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If I meant to say that Energy has "rest mass", I would have said "rest mass".
Instead, I said:
Quote:
Originally Posted by Yakk
First of all, [...] I [am] not talking about "rest mass".
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Photons have mass. They have no rest mass. All energy, no matter what form, has mass.
If you take two atoms that each weigh X, and bind them together so that Y energy is absorbed by the breaking of the bond, the resulting molecule will have (2X-Y/c^2) mass.
If you take a proton and a neutron that weigh P and N, and you bind them together such that Z energy is absorbed by breaking their bond, the resulting atom will have (P+N-Z/c^2) mass.
You heat something up, the same amount of matter will now have an extremely small increase in the amount it bends space and how hard it is to change it's velocity. Otherwise known as it's mass.
As an aside, fckm, you forgot 'in a closed system' requirements in your 2nd law.